Features and advantages
Fast digital PID control
Graph 5 - Hot water valve opening control
The introduction of new digital PID control stabilises the
chilled/hot water temperature with high accuracy. It quickly
responds to the load fluctuation and supplies stable chilled/
hot water temperature. It is suitable for air-conditioning
intelligent buildings which require sophisticated control.
15 minutes
30 minutes
Hot water consumption (%)
Hot water control opening ratio (%)
Hot water consumption
Temperature (°C)
Balancing the load and flow rate with the absorbent pump’s
inverter control enables efficient and energy-saving operation.
As a result, it reduces input energy and electric power
consumption. Running cost is decreased by 5% compared to
non-inverter control.
Hot water control valve
opening ratio
Cooling water entering temp.
Chilled water entering temp.
Graph 4 - Running cost curve
Chilled water leaving temp.
100
Time (minutes)
Expansion of safe operating zone
80
■■ This ensures quick response to rapid changes and
maintains stable operation.
■■ The safe operating zone is between 19 °C and 34 °C
cooling water temperature (for a nominal cooling water
entering temperature of 32 °C).
Non-inverter
control
60
40
Graph 6 - Safe operating zone chart
Inverter
control
20
0
100
20
40
60
80
100
Cooling load factor (%)
Not